> it also seems super-sensible to focus on Mac only for now

I’m the first guy to agree to reduced scope, but unfortunately the reality of cross platform is that the subtle details affect the APIs, and once you add more platforms, you can realize issues too late. As a simple example, MacOS has a concept of “showing/activating the app” whereas Windows has… well individual windows. They add up, especially if you add mobile to the mix.

I think the most sensible is to keep the api surface small, and also to peek at electron, tauri etc to learn and try not making expensive mistakes.